Secondary winding for induction-motors.



T. HOOGK.

SECONDARY WINDING FOR INDUCTION MOTORSx APPLICATION FILED JUNEG, 1911.

rammed May 12, 1914.

Ely 6.

1 5 i ,INVENTOR E AfiORNEY wnmssgs:

UNITED STATES PATENT ormon- THEODORE HOOCK, 0F WILKINSBURG,PENNSYLVANIA. ASSIGNOR T0 WESTINGHOUSE ELECTRIC AND MANUFACTURINGCOMPANY. A. CORPORATION OF PENNSYLVANIA.

SECONDARY WINDING FOR INDUCTION-MOTORS.

specification of Letters Patent.

, 'a-tented M ay 12, 1914...

Application filed June 6, 1911. Serial No. 631,595.

To all whom-it mag concern:

Be it known thatl 'lmconomc l'lOOOK a subject of the Emperor of Germany,and a resident of \Vilkinsburg, in the county of rality of conductingbars Secured to the rings by screws or bolts have been largely used, but

the necessarily large number of tapped holes renders a winding ofthistype relatively expensive. I z

By my present invention, I provide a winding of the general characterindicated above which. possesses the advantages of the 'windingsheretofore used withoutentailing the usual amount of labor and expense.

Figure 1 of the accompanying drawings is a planview of a portion of aninduction motor rotor having awinding constructed "yand'arrang'ed inaccordance with my inventio'nlnnd Fig. 2 is an end elevation. partiallyin section, of the parts shown in Fig. '1. Fig. 3 is a. fragmentaryview, correspondmgt-o Fig. 1, of a slightly modificdstructure embodyingmy invention, and Figs.

4, 5 and 6 are detail views, on a larger scale, of the bars shown inFig. 3.

' Referring to Figs. 1 and 2 of the drawings, a core member 1 having aplurality of peripheral slots 2, is provided with a. wind ing. of thesquirrel cage type, comprising a plurality of bars 3 of conductingmaterial, twoiiojf which are preferably located in each of the slots 2,and end connecting rings 4.

'Each slot 2 is partially closed by a projection 5 at one side of anadjacent core tooth 6, and the bars 3 are so proportioncdthat one ofthem may be inserted directly into each of the slots, moved laterallyunder the -projection 5, and a second bar placed in poare bent laterallyin opposite directions, as

shown in Fig. 1, so that theyconstilute a. continuous end ring. In orderto improve the conductivity (t the engaging end portions of the bars,the)? may be soldered to gether and theyare held in place. even when therotor. of which they are parts. is operating at high speeds, by meansofthc rings 4 which are preferably shrunk into position upon said endportions. The rings 1 may be so combined. with the .ends of the bars 3as to connect them electrically and reinforce them mechanically or theymay provide only mechanical reintorccinem. as ma) be desired. I

The 'ends of the bars 3, instead of being bent laterally in oppositedirection, may; of course, be bent laterally in the same three tion and,in fact, it may be found prefcn able to bifurcate the ends of the barsand bend the two parts at each end laterally in opposite directions, asshown in Figs. 3 to 6. to which reference may now be had.

The ends of the bars 3 may he provided with notches to produce annulargrooves 7 in which suitably proportioned rings 8 (only one of which isshown) may he lo cated in order to ovcrchme the tendency for the bars tostraighten after they are bent. Each of the bars 3 is provided with aslot, or saw cut 9 and a notch 10 at each end. After the bars arelocated in the core slots and their ends 1.1 and 12 are bent laterallyin opposite directions. the rings 9 are shrunk into the grooves 7,formed by the notches 10. to securely hold the winding in position.

My invention is not restricted to l'l'lQfiPQ- cific details illustratedin the drawings and I desire that only such limitations shall be imposedas are indicated in the appended claims.

.l claim as my invention:

'1. The combination with a slotted core, of a winding con'iprisingspaced parallel conducting bars disposed in the core slots, the ends ofwhich are alike and are bent laterally and uniformly into engagementwith each other to form a ring the laminae of which are angularlydisposed with reference to the core ends. 1

2. A. winding for dynamo-electric machines comprising conducting barsthe ends of which are alike and are bent laterally and uniformly inopposite directions to such lot:

degree only as will effect engagement with 3 each other to constitutecontinuous conduct-- 7' ing end members. l 3. A secondary squirrel-cageWinding for i induction motors comprising parallel spaced conductingbars the end portions of which are alike and are bent laterally anduniformly to vsuch degree only as will efiect engagement with each otherand soldered is together to constitute conducting end rings.

4. A secondary member for induction mohaving tors comprising asubstantially cylindrical hey e215 core member having peripheral slotsand conducting bars disposed in said slots the 15 end portions of whichare alike and extend. beyond the ends of the slots and are bentlaterally and uniformly to such degree only as to effect engagement witheach other and soldered to constitute conducting end rings A secondarymember for induction Inotors comprising a substantially cylindrical coremember having peripheral slots, conducting bars; disposed in said slotsthe end portions of which are alike and extend beyond the ends of theslots and are bent lat-- erally and uniformly in 011' osite directionsto such degree only as to e ect engagement with each other, and bindingrings shrunk upon the end portions vto hold the bars 30 position in theslots.

6. A secondary member for induction motors comprising a substantiallycylindrical core member having peripheral slots and conducting barsdisposed in said slots and

